KChart/Polar/KChartPolarGrid.cpp

0001 /*
0002  * SPDX-FileCopyrightText: 2001-2015 Klaralvdalens Datakonsult AB. All rights reserved.
0003  *
0004  * This file is part of the KD Chart library.
0005  *
0006  * SPDX-License-Identifier: GPL-2.0-or-later
0007  */
0008
0009 #include "KChartPolarGrid.h"
0010
0011 #include "KChartPaintContext.h"
0012 #include "KChartPolarDiagram.h"
0013 #include "KChartPieDiagram.h"
0014 #include "KChartPrintingParameters.h"
0015 #include "KChartMath_p.h"
0016
0017 #include <QPainter>
0018
0019 using namespace KChart;
0020
0021
0022 DataDimensionsList PolarGrid::calculateGrid(
0023     const DataDimensionsList& rawDataDimensions ) const
0024 {
0025     qDebug("Calling PolarGrid::calculateGrid()");
0026     Q_ASSERT_X( rawDataDimensions.count() == 2, "PolarGrid::calculateGrid",
0027                 "calculateGrid() expects a list with exactly two entries." );
0028     Q_ASSERT_X( dynamic_cast< PolarCoordinatePlane* >( mPlane ), "PolarGrid::calculateGrid",
0029                 "PaintContext::calculatePlane() called, but no polar plane set." );
0030
0031     DataDimensionsList l;
0032
0033     //FIXME(khz): do the real calculation
0034
0035     l = rawDataDimensions;
0036
0037     return l;
0038 }
0039
0040
0041 void PolarGrid::drawGrid( PaintContext* context )
0042 {
0043 //    if ( d->coordinateTransformations.size () <= 0 ) return;
0044
0045     const QBrush backupBrush( context->painter()->brush() );
0046     context->painter()->setBrush( QBrush() );
0047     PolarCoordinatePlane* plane = dynamic_cast<PolarCoordinatePlane*>(context->coordinatePlane());
0048     Q_ASSERT_X ( plane, "PolarGrid::drawGrid",
0049                  "Bad function call: PaintContext::coodinatePlane() NOT a polar plane." );
0050
0051     const GridAttributes gridAttrsCircular( plane->gridAttributes( true ) );
0052     const GridAttributes gridAttrsSagittal( plane->gridAttributes( false ) );
0053
0054     //qDebug() << "OK:";
0055     if ( !gridAttrsCircular.isGridVisible() && !gridAttrsSagittal.isGridVisible() ) return;
0056     //qDebug() << "A";
0057
0058     // FIXME: we paint the rulers to the settings of the first diagram for now:
0059     AbstractPolarDiagram* dgr = dynamic_cast<AbstractPolarDiagram*> (plane->diagrams().first() );
0060     Q_ASSERT ( dgr ); // only polar diagrams are allowed here
0061
0062
0063     // Do not draw a grid for pie diagrams
0064     if ( dynamic_cast<PieDiagram*> (plane->diagrams().first() ) ) return;
0065
0066
0067     context->painter()->setPen ( PrintingParameters::scalePen( QColor ( Qt::lightGray ) ) );
0068     const qreal min = dgr->dataBoundaries().first.y();
0069     QPointF origin = plane->translate( QPointF( min, 0 ) ) + context->rectangle().topLeft();
0070     //qDebug() << "origin" << origin;
0071
0072     const qreal r = qAbs( min ) + dgr->dataBoundaries().second.y(); // use the full extents
0073
0074     if ( gridAttrsSagittal.isGridVisible() ) {
0075         const int numberOfSpokes = ( int ) ( 360 / plane->angleUnit() );
0076         for ( int i = 0; i < numberOfSpokes ; ++i ) {
0077             context->painter()->drawLine( origin, plane->translate( QPointF( r - qAbs( min ), i ) ) + context->rectangle().topLeft() );
0078         }
0079     }
0080
0081     if ( gridAttrsCircular.isGridVisible() )
0082     {
0083         const qreal startPos = plane->startPosition();
0084         plane->setStartPosition( 0.0 );
0085         const int numberOfGridRings = ( int )dgr->numberOfGridRings();
0086         for ( int j = 0; j < numberOfGridRings; ++j ) {
0087             const qreal rad = min - ( ( j + 1) * r / numberOfGridRings );
0088
0089             if ( rad == 0 )
0090                 continue;
0091
0092             QRectF rect;
0093             QPointF topLeftPoint;
0094             QPointF bottomRightPoint;
0095
0096             topLeftPoint = plane->translate( QPointF( rad, 0 ) );
0097             topLeftPoint.setX( plane->translate( QPointF( rad, 90 / plane->angleUnit() ) ).x() );
0098             bottomRightPoint = plane->translate( QPointF( rad, 180 / plane->angleUnit() ) );
0099             bottomRightPoint.setX( plane->translate( QPointF( rad, 270 / plane->angleUnit() ) ).x() );
0100
0101             rect.setTopLeft( topLeftPoint + context->rectangle().topLeft() );
0102             rect.setBottomRight( bottomRightPoint + context->rectangle().topLeft() );
0103
0104             context->painter()->drawEllipse( rect );
0105         }
0106         plane->setStartPosition( startPos );
0107     }
0108     context->painter()->setBrush( backupBrush );
0109 }